Home |
Search |
Today's Posts |
|
#1
|
|||
|
|||
A question about boat weight and displacement
Just give the DOT a call. They can tell you the bottom line instantly.
10'6" is definately wide for towing, but I don't think it is wider than a standard tractor-trailer. Non of this has anything to do with weight and displacement though. Doug s/v Callista wrote in message ... On 1 Apr 2004 01:27:50 -0000, Ante Topic Mimara ] wrote: I am having trouble attempting to determine the weight of a boat, with limited information about it. [snip] Here is the information I have on this vessel: Hull Material: Wood LOA: 28' Beam: 10'-6" Displacement: 6,075 lbs Draft: 2'-2" With a beam of 10' 6" won't you will be towing an oversize load which will require a special permit and special arrangments each time that you tow this boat only during daylight hours? |
#2
|
|||
|
|||
A question about boat weight and displacement
As far as I know displacement = weight. Certainly the weight of the boat will
displace the amount of water with that same weight (hence the term displacement). That said, for documentation purposes the Coast Guard refers to a tonnage (don't recall if they call it displacement) that relates only to boat volume, not the weight. |
#3
|
|||
|
|||
A question about boat weight and displacement
As far as I know displacement = weight. Certainly the weight of the boat
will displace the amount of water with that same weight (hence the term displacement). That said, for documentation purposes the Coast Guard refers to a tonnage (don't recall if they call it displacement) that relates only to boat volume, not the weight. Although not as common as a reference to cubic volume, calculating the weight of a vessel is an uncommon but still correct use for the term tonnage. When speaking of volume, gross tonnage is the total amount of space contained within the hull, divided into 100 cubic foot portions. Net tonnage is the total volume, less the space taken up by engines, generators, fuel tanks, etc. A boat with 1000 cubic feet of open area where cargo could, theoretically, be carried would be rated at 10 net tons. Would have nothing to do with that vessel weighing 20,000 pounds.......which unless by sheer happenstance it probably would not. Then it gets a bit trickier yet. In many cases a "ton" refers to a "long ton" of 2240 pounds. Undoubtedly some young woman once who got pretty drunk, was slurring her speech, and started fantasizing about looking for man who was a good kisser with a "long ton"...... have to wonder if she would have thought a long ton was so desirable if it came attached to a guy who weighed 2240 pounds. :-) |
#4
|
|||
|
|||
A question about boat weight and displacement
As far as I know displacement = weight. Certainly the weight of the boat
will displace the amount of water with that same weight (hence the term displacement). That said, for documentation purposes the Coast Guard refers to a tonnage (don't recall if they call it displacement) that relates only to boat volume, not the weight. Although not as common as a reference to cubic volume, calculating the weight of a vessel is an uncommon but still correct use for the term tonnage. When speaking of volume, gross tonnage is the total amount of space contained within the hull, divided into 100 cubic foot portions. Net tonnage is the total volume, less the space taken up by engines, generators, fuel tanks, etc. A boat with 1000 cubic feet of open area where cargo could, theoretically, be carried would be rated at 10 net tons. Would have nothing to do with that vessel weighing 20,000 pounds.......which unless by sheer happenstance it probably would not. Then it gets a bit trickier yet. In many cases a "ton" refers to a "long ton" of 2240 pounds. Undoubtedly some young woman once who got pretty drunk, was slurring her speech, and started fantasizing about looking for man who was a good kisser with a "long ton"...... have to wonder if she would have thought a long ton was so desirable if it came attached to a guy who weighed 2240 pounds. :-) |
#5
|
|||
|
|||
A question about boat weight and displacement
DUINK writes:
As far as I know displacement = weight. Somehow, this doesn't sound right to me. Certainly the weight of the boat will displace the amount of water with that same weight (hence the term displacement). If something displaces X pounds of water, it must weigh X - n to be able to float. It must weigh less than the amount of water it displaces, else it will have neutral (or worse, negative) buoyancy. Having said this, how do I determine how much it weighs, from limited information, without being there to weigh it? That said, for documentation purposes the Coast Guard refers to a tonnage (don't recall if they call it displacement) that relates only to boat volume, not the weight. This is very interesting. It also has nothing to do with what I asked originally. I cannot see inquiring of the Coast Guard about the tonnage or volume of a 28 foot motor boat. What can they tell me about how much this vessel weighs, by me inquiring about the volume of the boat? I do not understand where you were going with this. Do you have anything to add that will address the original question? --- - Topic-Mimara Unique in the World! --- -=- This message was posted via two or more anonymous remailing services. |
#6
|
|||
|
|||
A question about boat weight and displacement
On 1 Apr 2004 14:14:21 -0000, Ante Topic Mimara
] wrote: DUINK writes: As far as I know displacement = weight. Somehow, this doesn't sound right to me. Certainly the weight of the boat will displace the amount of water with that same weight (hence the term displacement). If something displaces X pounds of water, it must weigh X - n to be able to float. It must weigh less than the amount of water it displaces, else it will have neutral (or worse, negative) buoyancy. This is Archimedes principle "a body immersed in a fluid is buoyed up by a force equal to the weight of the displaced fluid." http://www.infoplease.com/ce6/sci/A0804583.html Having said this, how do I determine how much it weighs, from limited information, without being there to weigh it? Displacement equals weight. Jack __________________________________________________ Jack Dale Swiftsure Sailing Academy Director ISPA and CYA Instructor http://www.swiftsuresailing.com Phone: 1 (877) 470-SAIL (toll free) __________________________________________________ |
#7
|
|||
|
|||
A question about boat weight and displacement
On 1 Apr 2004 14:14:21 -0000, Ante Topic Mimara
] wrote: DUINK writes: As far as I know displacement = weight. Somehow, this doesn't sound right to me. Certainly the weight of the boat will displace the amount of water with that same weight (hence the term displacement). If something displaces X pounds of water, it must weigh X - n to be able to float. It must weigh less than the amount of water it displaces, else it will have neutral (or worse, negative) buoyancy. This is Archimedes principle "a body immersed in a fluid is buoyed up by a force equal to the weight of the displaced fluid." http://www.infoplease.com/ce6/sci/A0804583.html Having said this, how do I determine how much it weighs, from limited information, without being there to weigh it? Displacement equals weight. Jack __________________________________________________ Jack Dale Swiftsure Sailing Academy Director ISPA and CYA Instructor http://www.swiftsuresailing.com Phone: 1 (877) 470-SAIL (toll free) __________________________________________________ |
#8
|
|||
|
|||
A question about boat weight and displacement
Comments below:
"Ante Topic Mimara" ] wrote in message news:XLTQSVUD38078.3849652778@anonymous... DUINK writes: As far as I know displacement = weight. Somehow, this doesn't sound right to me. Certainly the weight of the boat will displace the amount of water with that same weight (hence the term displacement). If something displaces X pounds of water, it must weigh X - n to be able to float. It must weigh less than the amount of water it displaces, else it will have neutral (or worse, negative) buoyancy. You aren't thinking this through completely. A boat's weight is equal to its displacement. In other words, the weight of the amount of water it displaces (or moves out of the hole in the water it makes when floating) is equal to the weight of the boat displacing that water. If a boat displaces X pounds of water it weighs X, if it weighed X-n it would only displace X-n. If it weighs more it will displace more water until you get to the point it can no longer displace more water as it has sank/submerged. In a sense, any boat floating is at neutral boyancy (it is neither rising out of the water, nor is it sinking) but has lots of reserve boyancy (the part of the hull above the water line which would displace more water if it was forced down into the water) to accomodate additional weight that may be added. Or to provide freeboard to keep waves from coming abord, wahtever. There are a number of different way displacement is listed. Others get into that in later posts. I though I'd try to clear up this aspect here. -- Ken Heaton & Anne Tobin Cape Breton Island, Canada kenheaton AT ess wye dee DOT eastlink DOT ca Having said this, how do I determine how much it weighs, from limited information, without being there to weigh it? That said, for documentation purposes the Coast Guard refers to a tonnage (don't recall if they call it displacement) that relates only to boat volume, not the weight. This is very interesting. It also has nothing to do with what I asked originally. I cannot see inquiring of the Coast Guard about the tonnage or volume of a 28 foot motor boat. What can they tell me about how much this vessel weighs, by me inquiring about the volume of the boat? I do not understand where you were going with this. Do you have anything to add that will address the original question? --- - Topic-Mimara Unique in the World! --- -=- This message was posted via two or more anonymous remailing services. |
#9
|
|||
|
|||
A question about boat weight and displacement
Comments below:
"Ante Topic Mimara" ] wrote in message news:XLTQSVUD38078.3849652778@anonymous... DUINK writes: As far as I know displacement = weight. Somehow, this doesn't sound right to me. Certainly the weight of the boat will displace the amount of water with that same weight (hence the term displacement). If something displaces X pounds of water, it must weigh X - n to be able to float. It must weigh less than the amount of water it displaces, else it will have neutral (or worse, negative) buoyancy. You aren't thinking this through completely. A boat's weight is equal to its displacement. In other words, the weight of the amount of water it displaces (or moves out of the hole in the water it makes when floating) is equal to the weight of the boat displacing that water. If a boat displaces X pounds of water it weighs X, if it weighed X-n it would only displace X-n. If it weighs more it will displace more water until you get to the point it can no longer displace more water as it has sank/submerged. In a sense, any boat floating is at neutral boyancy (it is neither rising out of the water, nor is it sinking) but has lots of reserve boyancy (the part of the hull above the water line which would displace more water if it was forced down into the water) to accomodate additional weight that may be added. Or to provide freeboard to keep waves from coming abord, wahtever. There are a number of different way displacement is listed. Others get into that in later posts. I though I'd try to clear up this aspect here. -- Ken Heaton & Anne Tobin Cape Breton Island, Canada kenheaton AT ess wye dee DOT eastlink DOT ca Having said this, how do I determine how much it weighs, from limited information, without being there to weigh it? That said, for documentation purposes the Coast Guard refers to a tonnage (don't recall if they call it displacement) that relates only to boat volume, not the weight. This is very interesting. It also has nothing to do with what I asked originally. I cannot see inquiring of the Coast Guard about the tonnage or volume of a 28 foot motor boat. What can they tell me about how much this vessel weighs, by me inquiring about the volume of the boat? I do not understand where you were going with this. Do you have anything to add that will address the original question? --- - Topic-Mimara Unique in the World! --- -=- This message was posted via two or more anonymous remailing services. |
#10
|
|||
|
|||
A question about boat weight and displacement
DUINK writes:
As far as I know displacement = weight. Somehow, this doesn't sound right to me. Certainly the weight of the boat will displace the amount of water with that same weight (hence the term displacement). If something displaces X pounds of water, it must weigh X - n to be able to float. It must weigh less than the amount of water it displaces, else it will have neutral (or worse, negative) buoyancy. Having said this, how do I determine how much it weighs, from limited information, without being there to weigh it? That said, for documentation purposes the Coast Guard refers to a tonnage (don't recall if they call it displacement) that relates only to boat volume, not the weight. This is very interesting. It also has nothing to do with what I asked originally. I cannot see inquiring of the Coast Guard about the tonnage or volume of a 28 foot motor boat. What can they tell me about how much this vessel weighs, by me inquiring about the volume of the boat? I do not understand where you were going with this. Do you have anything to add that will address the original question? --- - Topic-Mimara Unique in the World! --- -=- This message was posted via two or more anonymous remailing services. |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Update on ICOM M-502 | General | |||
offshore fishing | General | |||
Boat Displacement | Boat Building |